Self-threading shuttle



April 29, 1930 w. H. WAKEFIELD 1,756,612

SELF THREADING SHUTTLE Filed Jan. l5, 1929 f lllluQliiiimalllillllHmmm llu-` I 'Wa/f /f Mfg/M "9 6 7 MMM@ Patented Apr. 29, 1930 Unirse & KNOWLES LOOM WORKS, F VIORCESTER,

MASSACHUSETTS `sitter-Tnrnninrnef SHTTLE Application med January 15, 1929. serial 110.332,65..

' rIhis invention relates to self-threading shuttles and it is the general object of the invention to provide a shuttle of this type which will offer more resistance ortension to the passage of the thread in the normal direction than is offered to the thread when moving in the reverse direction. l

In weft replenishing looms operating with fine filling such, for instance, as silk or rayon it is desirable to create a tension on the filling the first pick after transfer. Also, at the time of transfer the weft end which extends from the outgoing bobbin back to the selvage is withdrawn in a reverse direction through the shuttlev eye, but is subjected to the same tension Vas that operating during normal Weaving. The effect of this is to retardor break the weft end of the outgoing bobbin so that a portion of filling remains in the box to be whipped by the shuttle in the shed to cause `an imperfection of the cloth. lIt is an important object of my present invention to provide a shuttle tension operative on the first pick of the loom to establish normal or relatively high tension but which will be e'ective at the time of transfer to exert a reduced tenion on the filling when the latter is being drawn in a reverse direction through the shuttle eye due to the movement of the outgoing bobbin. Y It is a more particular object of my present invention to provide a substantially fixed post with respect to the shuttle and to have the same engaged by a tension member movable about a pivot so placed that the movement of the weft in the normal direction tends to draw the tension member against the post due to the location of the pivot of said tensioning member. It is a still further object of my present invention to arrange the previously mentioned post and tensioningV member so that when the weft is drawn in the reverse direction through the eye the natural effect of the movement of the'iilling will be to move the tension member away from the post to reduce the tension. Y Y With these and other objects in View which will appear as the description proceeds, my 50 invention resides in the combination and arrangement of parts hereinafter described and .OFFICE Fig. 2 is an enlarged top plan view of'a f portionof Fig. 1, the shuttle in both of these views being threaded to pay 0E yarn inthe normal or forward direction,

Fig. 3 is a front elevation taken in the direction of arrow 3, Fig. 1 on an enlarged scale,

Figs. 4 and 5 are vertical sections on lines H and 5-5, respectively, of Fig. 3, 'and' Figs. 6 and 7 are diagrammatic views show ing the relation of my invention when the thread is moving in normal and reversed direction, respectively.

Referring to the drawings' I have Vshown the shuttle S having at the left hand end as viewed in Fig. 1 Vthe usual spring clips 10 which receive the rings 11 ofthe butt'12 of a :weft replenishing bobbin B.V One wall of the shuttle may, if desired, be lined with fur as indicated at'13 to exert friction on the weft 'as the latter is unwound from the bobbin. vAt the opposite end of the shuttle is located traversed by the filling W 'andthis is an important feature of my present invention. As

-shown herein thestud 18 lies beyond post 15 with reference to the path normally traversed .by the weft, and also lies rearwardlyof the post 15. A yielding member 19 is. coiled around the Alower portion of the stud'18a`nd has a horizontal arm 2() which terminates in e an upstandlng tensioning relement 21.l The As shown clearly in F ig. 2 the post 15 and ,90 p

vstud 18 lie at dierent points along the path manner and has an opening through which i the weft AYV may extend and trail along a which has engagement with 'a second diagonal groove 26 formed in the front wall of the shuttle. i

The tensioning element 21 is normally held yieldingly against the post 15 by means of .a light spring 27 one end of which-,extends into an Vopening 28 in thevertical wall 29 of the eye as shown in Figli,4 and the other end of Y extension 30 of the member 19. The spring and member 19 are so'relatedy that thetensioning element 21 normally lies against the post 15; said tensioning element being' preferably in engagement with the pestat a point slightlyl beyond the axis of the post with respect -to the normal path traversed by the filling W.

The eyeuE of the shuttle is provided with a 1 pair of threadersfl and32'which extend diagonally inY opposite directions, one of these f elements overlapping the other. An opening 33:is formed below the threaders in the left handwall as viewed in Figs. 2 and 3 of the eye E for the reception of the filling WV.. The upper right hand portion ofthe eye as shown in Fig.4 2 may be provided with bea-ks l34and 35 which cooperate to deflect th'e'iilling downwardlyon the iirst`pick of the loomafter transfer. The'. threading elements` 31 and 32 together with the deflecting beaks 34 and 35 Vmay be of theA usual construction Aand are shown herein simply as effective means for directing the filling so that it will enter the previously described lupwardly flaring notch 2 Y -tthe time of transfer the fillingv will extend across the threadingelements v31 and 32 and also the beak 3 4. During the first flight of the shuttle after transfer the` weft will move downwardly into the opening 33 and i will also move under the beak 35,V extending vthroughout thefirst'flight in a substantially .straight line from the bobbin B across the .right end of the Vshuttle towardV the right DuringV selvage of the ,cloth being woven. this first flight the weft will move downwardly between the end tension element 21 and the conical point 17 of the post 15 and will move in the direction indicated-by arrow N" inFig.

6. Because ofthe location of the pivot for the tensioning member Vor Yelement'21 the latter will'be drawn toward thel post'by the filling by a force aetin'ggin addition tothat exerted normally by the light tension spring 27.

Duringfweavingthe tension exerted on vthe weft will `be that exerted not VonlyfbyY the spring but also'that caused by the fact that the' filling in moving between the post 15' and the element 21 will tend to clamp or draw the latter toward the post.

it the time of transfer it is customary to outv VYforth herein,lhowever, when the filling moves Y in a reverse direction it tends to move the tensioningelement 21 away. fromy the post 15 so that the only force acting to pinehthe filling, between the tensioningv elementandsai'd post` is that exerted bythe light Vspring 27 .Asa

result the weft is withdrawnfrom the eye in aV reversed direction with reducedtendency for breaking yand there is. less'likelihood that there will remain in the `shuttle or in the shuttle boxV a weft end which may later be drawn into the shed to form an imperfection in the cloth.V

, From the foregoingV it will be seen that I have provided'a shuttle tensionwhich offers more'resistance to filling when moving in the normal direction than .is offered when'then filling moves in a reverse direction Vat the time of transfer. l lt will further be seenfth'atfbyl pivoting oneof the tensioning elements about val axis substantially as set forth-'in the drawings and farther along on thepath normally :ico

traversed by the filling than the cooperating K Y fixed element is located-I have provided a nor"- mally functioningv snubbing action which is absent at the time of trans-fer when the filling tends to move in a reverse direction.

Having thus described my invention it will be seen that changes and modifications may be -made therein by those skilled in the art without departing from the spirit and scope of the invention and'I do lnot wish to be limited to the details claim is: Y. 1. ln a shuttle having provision for supporting a bobbin fromwhich extends a weft end, v said shuttley having ya thread Vpassage through which the weft-extends, a pair of coactingtensioning elements Voneof which is 5 herein disclosechy butA what 'If ies normally stationary with respect to the shuttle,` and a pivot for the other element removed from the first named element with respect to the lengthof theshuttle, 'said second named.

elementmoving'about its pivot into engagement with the first named element and being acted upon to move toward the first named element when the weft from the bobbin is moving in the normal direction through the thread passage, said second named element tending to move away from the rst named element when the weft is reversed as to its direction through the thread passage.

2. In a shuttle having provision for supporting a bobbin from which extends a weft end, said shuttle having a. thread passage through which the weft extends, an upstanding post fixed with respect to the shuttle, a movable tension element to engage the post,

and means defining a pivot around which the movable element may rock, said pvot being spaced from the post in the direeton `of the length of the shuttle, said movable tensioning element tending when the weft moves through the thread passage in the normal direction to be drawn toward the post and said movable tensioning element when the thread moves in the reverse direction movng'away from the post. Y

3. In a shuttle having provision for supporting a bobbin from which extends a weft end, said shuttle having a thread passage through which the weft extends, an upstanding post fixed with respect tothe shuttle, a movable tension element toengage the post, and means defining a pivot around which the movable element may rock, said pivot being spaced from the post in the direction of the length of' the shuttle, said pivot also being spaced laterally from the post with respect to the width of the shuttle7 said movable tensioning element tending when the weft moves through the thread passage inthe normal direction to be drawn toward the post and said movable tensioning element when the thread moves in the reverse direction moving away from the post.

In testimony whereof I have hereunto affixed my signature.

WALTER H. WAKEFIELD. 

